/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Unity Technologies.
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

using System;
using System.IO;
using UnityEngine;

namespace Hackerzhuli.Code.Editor
{
    internal static class FileUtility
    {
        public const char WinSeparator = '\\';
        public const char UnixSeparator = '/';

        public static string GetPackageAssetFullPath(params string[] components)
        {
            // Unity has special IO handling of Packages and will resolve those path to the right package location
            return Path.GetFullPath(Path.Combine("Packages", "com.hackerzhuli.ide.visualstudio",
                Path.Combine(components)));
        }

        public static string GetAssetFullPath(string asset)
        {
            var basePath = Path.GetFullPath(Path.Combine(Application.dataPath, ".."));
            return Path.GetFullPath(Path.Combine(basePath, NormalizePathSeparators(asset)));
        }

        public static string NormalizePathSeparators(this string path)
        {
            if (string.IsNullOrEmpty(path))
                return path;

            if (Path.DirectorySeparatorChar == WinSeparator)
                path = path.Replace(UnixSeparator, WinSeparator);
            if (Path.DirectorySeparatorChar == UnixSeparator)
                path = path.Replace(WinSeparator, UnixSeparator);

            return path.Replace(string.Concat(WinSeparator, WinSeparator), WinSeparator.ToString());
        }

        public static string NormalizeWindowsToUnix(this string path)
        {
            if (string.IsNullOrEmpty(path))
                return path;

            return path.Replace(WinSeparator, UnixSeparator);
        }

        internal static bool IsFileInProjectRootDirectory(string fileName)
        {
            var relative = MakeRelativeToProjectPath(fileName);
            if (string.IsNullOrEmpty(relative))
                return false;

            return relative == Path.GetFileName(relative);
        }

        public static string MakeAbsolutePath(this string path)
        {
            if (string.IsNullOrEmpty(path)) return string.Empty;
            return Path.IsPathRooted(path) ? path : Path.GetFullPath(path);
        }

        // returns null if outside of the project scope
        internal static string MakeRelativeToProjectPath(string fileName)
        {
            var basePath = Path.GetFullPath(Path.Combine(Application.dataPath, ".."));
            fileName = NormalizePathSeparators(fileName);

            if (!Path.IsPathRooted(fileName))
                fileName = Path.Combine(basePath, fileName);

            if (!fileName.StartsWith(basePath, StringComparison.OrdinalIgnoreCase))
                return null;

            return fileName[basePath.Length..]
                .Trim(Path.DirectorySeparatorChar);
        }
    }
}